SiCf/SiC　composite　materials　are　essential　for　spacecraft　thermal　protection,　determining　the　safety　of　spacecraft.　However,　their　complex　structures　and　intricate　fabrication　processes　have　led　to　an　unclear　understanding　of　their　failure　mechanisms,　limiting　their　application.　In　this　study,　circumferential　compression　experiments　were　conducted,　and　X-ray　computed　tomography　(X-CT)　was　used　to　analyze　the　distribution　characteristics　of　pore　spaces.　The　experimental　results　indicate　that　damage　manifests　as　secondary　fracture　phenomena　based　on　temporal　evolution　characteristics.　Specifically,　after　experiencing　performance　degradation　of　24.73–60.96%,　the　material　still　maintained　basic　stability,　exhibiting　a　performance　recovery　of　31.55–36.1%　under　the　applied　load　until　failure.　To　predict　the　dynamic　damage　behavior　of　materials　at　multiple　scales,　a　multi-scale　method　combining　statistical　and　microscopic　approaches　was　proposed.　A　micro　representative　volume　element　(RVE)　random　fiber　pore　distribution　model　was　established　based　on　random　processes　and　random　medium　theory.　Finally,　considering　the　CT　data　and　the　principle　of　minimum　potential　energy,　a　macroscopic　finite　element　model　of　the　micro-pores＇　structural　characteristics　in　a　three-dimensional　wound　tube　was　reconstructed.　The　results　indicate　that　cracks　initiate　around　pore　defects　and　gradually　propagate　to　form　crack　bands.　The　model　closely　matches　the　macroscopic　damage　and　microscopic　characteristics　of　the　material.　This　work　provides　a　new　approach　for　the　numerical　simulation　of　pore　defects　in　such　materials.　©　2024